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Basic and diluted loss per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net loss attributable to Atlantic Power Corporation $ (21.9) $ (18.5) $ (24.6) $ (33.5)
Denominator:        
Weighted average basic shares outstanding 115.2 121.6 115.0 121.8
Dilutive potential shares:        
Convertible debentures (in shares) 8.1 14.8 8.1 18.3
LTIP notional units (in shares)   0.1   0.1
Potentially dilutive shares 123.3 136.5 123.1 140.2
Basic and diluted loss per share attributable to Atlantic Power Corporation $ (0.19) $ (0.15) $ (0.21) $ (0.28)